Method for transferring authorization information, relay device, and server

ABSTRACT

Embodiments of the present application provide a method for transferring authorization information, a relay device, and a server. The method includes: receiving, by a DHCPv6 relay device, authorization information delivered by an AAA server; and inserting an option into a DHCPv6 Relay-Forward message, encapsulating the authorization information in the option, and sending the option to a DHCPv6 server. By using the technical solutions of the present application, a DHCPv6 relay device sends authorization information delivered by an AAA server to a DHCPv6 server, so that the DHCPv6 server can provide a correct configuration for a DHCPv6 client according to the authorization information delivered by the AAA server.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Patent Application No. PCT/CN2012/083290, filed on Oct. 22, 2012, which claims priority to Chinese Patent Application No. 201110349928.7, filed on Nov. 8, 2011, both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present application relates to a network communications technology, and in particular, to a method for transferring authorization information, a relay device, and a server.

BACKGROUND

Typical networking of the Dynamic Host Configuration Protocol for IPv6 (DHCPv6) that supports the Internet Protocol Version 6 (IPv6) includes three roles: a DHCPvb 6 client, a DHCPvb 6 server, and a DHCPvb 6 relay. The DHCPvb 6 client is a device that dynamically acquires an IPvb 6 address, a delegated IPvb 6 prefix, or other network configuration parameters. The DHCPvb 6 server is a device that is responsible for allocating an IPvb 6 address, an IPvb 6 prefix, or other network configuration parameters to the DHCPv6 client. When the DHCPvb 6 server and the DHCPvb 6 client are not within the scope of a same link, the DHCPvb 6 server and the DHCPvb 6 client need to use a DHCPvb 6 relay to forward a message, thereby avoiding deployment of a DHCPvb 6 server within the scope of each link. This saves costs and facilitates centralized management.

To ensure security of the allocation of an IPvb 6 address, a delegated IPvb 6 prefix, and other network configuration parameters, on existing DHCPvb 6 networking, a DHCPv6 client needs to be AAA-authenticated before DHCPvb 6 allocation is performed, and the DHCPvb 6 client can be allocated with an IPvb 6 address, an IPvb 6 prefix, and other network configuration parameters only after the authentication is successful.

In a practical application process, when determining that the authentication of the DHCPvb 6 client is successful, an AAA (Authentication-Authorization-Accounting) server authorizes some information related to address allocation to the DHCPvb 6 relay by using an Access-Accept message. However, currently, the authorization information cannot be transferred to the DHCPvb 6 server by using a DHCPvb 6 process, which limits flexibility of providing correct configurations to the DHCPvb 6 client by the DHCPvb 6 server and application scenarios.

SUMMARY

The present application provides a method for transferring authorization information, a relay device, and a server, which are used to send authorization information delivered by an AAA server to a DHCPvb 6 server, so that the DHCPvb 6 server can provide correct configuration information for a DHCPvb 6 client.

An embodiment of the present application provides a method for transferring authorization information, including:

receiving authorization information delivered by an AAA server; and

inserting an option into a DHCPvb 6 Relay-Forward message, encapsulating the authorization information in the option, and sending the option to a DHCPvb 6 server.

An embodiment of the present application provides a relay device, including:

a first receiving module, configured to receive authorization information delivered by an AAA server; and

an encapsulating module, configured to insert an option into a DHCPv6 Relay-Forward message, encapsulate the authorization information in the option, and send the option to a DHCPvb 6 server.

An embodiment of the present application provides a server, including:

a third receiving module, configured to receive authorization information which is encapsulated by using an option of a DHCPvb 6 Relay-Forward message and sent by a relay device, where the authorization information is delivered by an AAA server to the relay device; and

an allocating module, configured to allocate corresponding configuration information to a DHCPvb 6 client according to the authorization information.

According to the method for transferring authorization information, the relay device, and the server in the embodiments of the present application, the relay device inserts an option into a DHCPvb 6 Relay-Forward message, encapsulates authorization information in the option, and sends the option to a DHCPvb 6 server, so that the DHCPvb 6 server can provide a correct configuration for a DHCPvb 6 client according to the authorization information, thereby solving the problem of lack of information in the prior art caused by a failure of transferring authorization information to a DHCPvb 6 server by using a DHCPvb 6 process; and further, when the authorization information is information related to address allocation, such as designation of a specific prefix pool, a specific address pool, a specific address, or a specific prefix for the DHCPvb 6 client, the DHCPvb 6 server can allocate a correct address configuration to the DHCPvb 6 client according to the authorization information.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show some embodiments of the present application, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

FIG. 1 is a flowchart of a method for transferring authorization information according to an embodiment of the present application;

FIG. 2A is a structural diagram of a network for DHCPvb 6 authentication and address allocation according to an embodiment of the present application;

FIG. 2B is a flowchart of a method for allocating an IPvb 6 address according to an embodiment of the present application;

FIG. 2C shows a format of a DHCPvb 6 option according to an embodiment of the present application;

FIG. 2D shows a format of a sub-option Option_Address_Prefix_Auth according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a relay device according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a relay device according to another embodiment of the present application; and

FIG. 5 is a schematic structural diagram of a server according to an embodiment of the present application.

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the following clearly describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are a part rather than all of the embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

FIG. 1 is a flowchart of a method for transferring authorization information according to an embodiment of the present application. As shown in FIG. 1, the method in this embodiment includes:

Step 101: A DHCPvb 6 relay device receives authorization information delivered by an AAA server.

This embodiment is applicable to a DHCPvb 6 allocation process in which a device with a DHCPvb 6 relay function (called a relay device hereinafter) exists and participates in AAA authentication. The DHCPvb 6 allocation process is an address allocation process in which information, such as an IPvb 6 address, is allocated to a DHCPvb 6 client. In embodiments of the present application, the DHCPvb 6 client may be a customer premise equipment (CPE), a personal computer (PC), or the like; and the relay device may be a network access server (NAS).

In a practical application, when the DHCPvb 6 client needs to solicit IPvb 6 address information, the DHCPvb 6 client sends a Solicit message to solicit address information. The Solicit message carries such information as a Client Identifier option, an Identity Association for Non-temporary Addresses (IA_NA) option used for requesting an IPvb 6 address, and an Identity Association for Prefix Delegation (IA_PD) option used for requesting a delegated prefix, where the address information that needs to be solicited by the DHCPvb 6 client mainly refers to an IPvb 6 address, an IPvb 6 prefix, other network configuration parameters, and the like. When the DHCPvb 6 client is a CPE or a PC, the Client Identifier option may include a media access control (MAC) address of the CPE or a MAC address of the PC.

After receiving the Solicit message, the relay device sends an Access-Request message to the AAA server requesting identity authentication on the DHCPvb 6 client. The Access-Request message may carry such information as an access port identifier (such as NAS-Port or NAS-Port-ID) or a DHCPvb 6 client identifier. When the DHCPvb 6 client is the CPE or the PC, the DHCPvb 6 client identifier may be the MAC address of the CPE or the MAC address of the PC.

After receiving the Access-Request message, the AAA server performs identity authentication on the DHCPvb 6 client according to the information carried in the Access-Request message, and returns, to the relay device by using an Access-Accept message, a result that the DHCPvb 6 client passes the authentication or returns, to the relay device by using an Access-Reject message, a result that the DHCPvb 6 client fails to pass the identity authentication. When the DHCPvb 6 client passes the identity authentication, the AAA server further delivers some authorization information by using the Access-Accept message, where the authorization information delivered by the AAA server may include a name of an address pool or a name of a prefix pool, or may include a designated IPvb 6 address or a designated IPvb 6 prefix. For example, the AAA server may request a DHCPvb 6 server to allocate an IPv6 address within an address pool for a wide area network (WAN) of the DHCPvb 6 client by designating a name of the address pool; the AAA server may request the DHCPvb 6 server to allocate a delegated IPvb 6 prefix within a prefix pool for the DHCPvb 6 client by designating a name of the prefix pool; the AAA server may request the DHCPvb 6 server to allocate a specific IPvb 6 address for the DHCPvb 6 client by designating the IPvb 6 address; and the AAA server may request the DHCPvb 6 server to allocate a specific delegated IPvb 6 prefix for the DHCPvb 6 client by designating the IPvb 6 prefix.

Currently, a Radius address or prefix pool name attribute defined by IETF RFC2869 is Framed-Pool (Attribute 88); a Radius delegated IPvb 6 prefix attribute defined by IETF RFC4818 is Delegated-IPv6-Prefix (Attribute 123); and a Radius IPvb 6 address attribute defined by a Radext work group draft draft-ietf-radext-ipv6-access is Framed-IPv6-Address, a Radius delegated IPvb 6 prefix pool name attribute is Delegated-IPv6-Prefix-Pool, and a Radius stateful IPvb 6 address pool name attribute is Stateful-IPv6-Address-Pool. In the embodiments of the present application, the prefix pool name or the address pool name designated in the Radius attribute Framed-Pool, Delegated-IPv6-Prefix-Pool, or Stateful-IPv6-Address-Pool, the delegated IPvb 6 prefix designated in the Radius attribute Delegated-IPv6-Prefix, and the IPvb 6 address designated in the Radius attribute Framed-IPv6-Address may all be used as the authorization information delivered by the AAA server to the relay device (for example, a network access server NAS) after the DHCPv6 client passes the authentication.

Step 102: The DHCPvb 6 relay device inserts an option into a DHCPv6 Relay-Forward message, encapsulates the authorization information in the option, and sends the option to the DHCPvb 6 server.

In this embodiment, in order to send the authorization information delivered by the AAA server to the DHCPvb 6 server, the relay device inserts the option into a Relay-Forward message to be sent, encapsulates the authorization information in the option, and sends the option to the DHCPvb 6 server.

After receiving the Relay-Forward message, the DHCPvb 6 server acquires the authorization information by parsing the Relay-Forward message and performs a corresponding operation according to the authorization information. For example, when the authorization information is information related to address allocation, the DHCPvb 6 server may allocate address information to the DHCPvb 6 client according to the authorization information. More specifically, when the authorization information is a name of an address pool or a name of a prefix pool, the DHCPvb 6 server allocates an IPvb 6 address or a delegated IPvb 6 prefix from the address pool or the prefix pool to the DHCPvb 6 client.

In this embodiment, after receiving authorization information delivered by an AAA server, a relay device inserts a corresponding option into a Relay-Forward message, encapsulates the authorization information in the option, and sends the option to a DHCPv6 server, so that the DHCPvb 6 server can provide correct configuration information to a DHCPvb 6 client according to the authorization information. This solves the problem in the prior art that authorization information delivered by an AAA server cannot be transferred to a DHCPvb 6 server by using a DHCPvb 6 process; and further, when the authorization information is related to address allocation, the DHCPvb 6 server can dynamically allocate an IPvb 6 address or an IPvb 6 prefix in a designated address pool or a designated prefix pool to the DHCPv6 client according to the authorization information, or designate a specific IPvb 6 address or a specific IPvb 6 prefix for the DHCPvb 6 client according to the authorization information, thereby better meeting a flexibility requirement of an IPvb 6 service on configuration of a user address.

The following embodiment uses a DHCPvb 6 allocation process as an example to describe a process of transferring authorization information in detail.

FIG. 2A is a structural diagram of a network for DHCPvb 6 authentication and address allocation according to an embodiment of the present application. As shown in FIG. 2A, a relay device in this embodiment is a NAS, and a DHCPvb 6 client is a CPE. FIG. 2B is a flowchart of a method for allocating an IPvb 6 address according to an embodiment of the present application. As shown in FIG. 2B, the method in this embodiment includes:

Step 1: A CPE sends a Solicit message to a NAS, so as to send a DHCPvb 6 solicit.

Step 2: After receiving the Solicit message sent by the CPE, the NAS sends an Access-Request message to an AAA server, so as to request the AAA server to perform authentication on the CPE.

Step 3: The AAA server performs identity authentication on the CPE, and after the CPE passes the authentication, encapsulates authorization information in an Access-Accept message, and returns the Access-Request message to the NAS.

In this embodiment, one or more pieces of authorization information may exist. Each piece of the authorization information may be a name of an address pool or a name of a prefix pool, such as Framed-pool, Delegated-IPv6-Prefix-Pool, Stateful-IPv6-Address-Pool or the like.

Step 4: After receiving the Access-Accept message, the NAS acquires the authorization information of the CPE, encapsulates both the Solicit message from the CPE and the authorization information from the AAA server in a Relay-Forward message, and send the Relay-Forward message to the DHCPvb 6 server.

A first implementation manner in which the NAS encapsulates the authorization information in the Relay-Forward message is as follows:

The NAS inserts an option (which may also be called a DHCPvb 6 option) corresponding to each piece of the authorization information into the Relay-Forward message, for example, when two pieces of the authorization information are delivered by the AAA server, one piece of the authorization information is Framed-Pool, and the other piece of the authorization information is Delegated-IPv6-Prefix-Pool, the NAS inserts two DHCPv6 options into the Relay-Forward message, where one DHCPvb 6 option stores the authorization information Delegated-IPv6-Prefix-Pool, and the other DHCPvb 6 option stores the authorization information Framed-Pool.

Then, the NAS encapsulates each piece of the authorization information in the corresponding option and sends the option to the DHCPvb 6 server.

A format of the DHCPvb 6 option is shown in FIG. 2C, mainly including: an option type code field of a 2-byte length, an option data length field of a 2-byte length, and an option data field of a variable length. The option type code field is an identifier of an option type; the option data length field is used to identify a length of the option data field, and the option data field may be used to fill in content of the authorization information. For a more specific example, when the authorization information is an address pool or a prefix pool related to the address allocation, the corresponding option may be recorded as Option_Pool_Name, where the option type code field is a type code corresponding to Option_Pool_Name, and the option data field is used to fill in the name of the authorized address pool or prefix pool, for example, when the authorization information is Framed-Pool, the option data field may be filled with a character string of a name of an identifier (address or prefix) pool provided by Framed-Pool.

A second implementation manner in which the NAS encapsulates the authorization information in the Relay-Forward message is as follows:

The NAS inserts an option (in this implementation, the option may be called a container) corresponding to all the authorization information into the Relay-Forward message and places each piece of the authorization information in the option (or the container) by using sub-options; and then the NAS sends the option (or the container) to the DHCPv6 server.

In this implementation manner, the corresponding option (or the container) may be recorded as Option_Authorization and its format is also shown in FIG. 2C, mainly including: an option type code field of a 2-byte length, an option data length field of a 2-byte length, and an option data field of a variable length. The option type code field may be recorded as a type code corresponding to Option_Authorization, the option data field may be filled with the sub-options corresponding to the pieces of authorization information, and the sub-options may be recorded as authorization-options. Specifically, the NAS encapsulates a sub-option authorization-options corresponding to each piece of the authorization information in the Option_Authorization option (or the container), and sends the sub-option to the DHCPvb 6 server by using the Relay-Forward message.

Each sub-option may comply with a data structure of a DHCPvb 6 option shown in FIG. 2C and data structures of some sub-options may also be extended based on FIG. 2C. For example, when the authorization information delivered by the AAA server is used to designate a user IPvb 6 address or a delegated IPvb 6 prefix, the corresponding sub-option may be recorded as Option_Address_Prefix_Auth and its format may use a data structure shown in FIG. 2D. The data structure shown in FIG. 2D includes an option type code field of a 2-byte length, an option data length field of a 2-byte length, a prefix address length field of a 1-byte length, and an IPv6-prefix-address field of a 16-byte length. The option type code field is a type code corresponding to Option_Address_Prefix_Auth, and when the prefix address length (field) is 128, the IPv6-prefix-address (field) is correspondingly an IPvb 6 address.

The sub-option authoriztion-options may be the foregoing Option_Pool_Name used to encapsulate a designated name of an address pool or a prefix pool, or may be the foregoing Option_Address_Prefix_Auth used to encapsulate a designated address or prefix.

Step 5: The DHCPvb 6 server allocates IPvb 6 address information to the CPE according to the authorization information in the Relay-Forward message, encapsulates the allocated IPvb 6 address information in a Relay-Reply message, and returns the Relay-Reply message to the NAS functioning as a DHCPvb 6 relay device.

The IPvb 6 address information may be such information as an IPvb 6 address or a delegated IPvb 6 prefix.

Step 6: The NAS encapsulates the IPvb 6 address information returned by the DHCPvb 6 server in an Advertise message and sends the Advertise message to the CPE.

Step 7: The CPE sends a Request message to the NAS and the IPvb 6 address information is carried in the Request message.

Step 8: The NAS forwards the Relay-Forward message to the DHCPvb 6 server.

The Relay-Forward message includes the IPvb 6 address information in the Request message.

Step 9: The DHCPvb 6 server returns the Relay-Reply message to the NAS.

The Relay-Reply message includes the IPvb 6 address information in response to a request in the Relay-Forward message.

Step 10: The NAS returns a Reply message to the CPE.

The Reply message includes the IPvb 6 address information in the Relay-Reply message.

Step 7 to step 10 describe a process in which the CPE notifies the DHCPvb 6 server that the CPE has acquired the IPvb 6 address information. The process is the same as that in the prior art and therefore is not described in detail in this embodiment.

In this embodiment, a NAS inserts a DHCPvb 6 option into a Relay-Forward message and sends authorization information delivered by an AAA server to a DHCPv6 server by using the DHCPvb 6 option; the DHCPvb 6 server allocates correct IPvb 6 address information to a CPE according to the authorization information encapsulated in the received option, thereby solving the problem in the prior art that authorization information delivered by an AAA server and related to address information cannot be transferred to a DHCPv6 server by using a DHCPvb 6 process; and further, in this embodiment, the authorization information delivered by the AAA server is sent to the DHCPvb 6 server, so that the DHCPv6 server can dynamically allocate an IPvb 6 address or an IPvb 6 prefix in a designated address pool or prefix pool to a DHCPvb 6 client according to the authorization information, or designates a specific IPvb 6 address or IPvb 6 prefix for a DHCPvb 6 client according to the authorization information, thereby better fulfilling a flexibility requirement of an IPvb 6 service on configuration of a user address.

In addition, by using the method in this embodiment, the AAA server and the DHCPvb 6 server may be two devices independent from each other, thereby solving a network restraint caused by combining the AAA server and the DHCPvb 6 server into one server and better facilitating development of an IPvb 6 service.

It should be noted herein that this embodiment uses authorization information related to address allocation in a DHCPvb 6 allocation process as an example for description but the present application is not limited thereto. Regardless whether the authorization information is related to address allocation, the DHCPvb 6 option may be inserted into the Relay-Forward message and the authorization information delivered by the AAA may be encapsulated in the DHCPvb 6 option so as to send the authorization information to the DHCPvb 6 server.

FIG. 3 is a schematic structural diagram of a relay device according to an embodiment of the present application. As shown in FIG. 3, the relay device in this embodiment includes a first receiving module 31 and an encapsulating module 32.

The first receiving module 31 is configured to receive authorization information delivered by an AAA server. The encapsulating module 32 is connected to the first receiving module 31 and is configured to insert an option into a Relay-Forward message in a DHCPv6 process, encapsulate the authorization information in the option, and send the option to a DHCPvb 6 server.

The functional modules of the relay device described in this embodiment are configured to execute the process of the method for transferring authorization information shown in FIG. 1. For detailed operation principles, no further details are provided herein and reference may be made to the descriptions in the foregoing method embodiments.

The relay device in this embodiment, after receiving authorization information delivered by an AAA server, inserts an option into a Relay-Forward message, and sends the authorization information to a DHCPvb 6 server by means of the option, so that the DHCPv6 server can provide a correct configuration for a DHCPvb 6 client according to the authorization information, thereby solving the problem in the prior art that authorization information delivered by an AAA server cannot be transferred to a DHCPvb 6 server by using a DHCPv6 process. Further, when the authorization information is related to address allocation, the DHCPvb 6 server can dynamically allocate an IPvb 6 address or an IPvb 6 prefix in a designated address pool or prefix pool to the DHCPvb 6 client according to the authorization information, or designates a specific IPvb 6 address or IPvb 6 prefix for the DHCPvb 6 client according to the authorization information, thereby better fulfilling a flexibility requirement of an IPvb 6 service on configuration of a user address.

FIG. 4 is a schematic structural diagram of a relay device according to another embodiment of the present application. FIG. 4 is an extension based on FIG. 3, where the encapsulating module 32 includes a first inserting unit 321 and a first transferring unit 322.

The first inserting unit 321 is configured to insert an option corresponding to each piece of the authorization information into the Relay-Forward message. The first transferring unit 322 is connected to the first inserting unit 321 and the first receiving unit 31 and is configured to encapsulate each piece of the authorization information in the corresponding option, and send the option to the DHCPvb 6 server.

The functional units above may be configured to execute the process of the first implementation manner of step 4 in the embodiment shown in FIG. 2B. For detailed operation principles, no further details are provided herein and reference may be made to the descriptions in the foregoing method embodiments.

As shown in FIG. 4, the encapsulating module 32 in this embodiment may further include a second inserting unit 323 and a second transferring unit 324.

The second inserting unit 323 is configured to insert an option corresponding to all the authorization information into the Relay-Reply message; and the second transferring unit 324 is connected to the second inserting unit 323 and the first receiving module 31 and is configured to encapsulate all the authorization information in the option and send the option to the DHCPvb 6 server.

Further, the second transferring unit 324 is specifically configured to insert a sub-option corresponding to each piece of the authorization information into the option, encapsulate each piece of the authorization information in the corresponding sub-option, and send the sub-option to the DHCPvb 6 server.

In the DHCPvb 6 allocation process, each piece of the authorization information may be Framed-Pool, Delegated-IPv6-Prefix-Pool, Stateful-IPv6-Address-Pool, Delegated-IPv6-Prefix, Framed-IPv6-Address, or the like.

Further, the relay device in this embodiment further includes a second receiving module 33, where the second receiving module 33 is configured to receive configuration information which is delivered by the DHCPvb 6 server to the DHCPvb 6 client according to the authorization information.

The second receiving module 33 may be configured to execute a corresponding process in the method shown in FIG. 2B. For detailed operation principles, no further details are provided herein and reference may be made to the descriptions in the foregoing method embodiments.

The relay device in this embodiment implements insertion of an option into a Relay-Forward message by using an inserting unit and a transferring unit, and the relay device sends authorization information to a DHCPvb 6 server by using the option field; and the DHCPvb 6 server allocates correct configuration information to a CPE according to the authorization information encapsulated in the received option, thereby solving the problem in the prior art that authorization information delivered by an AAA server cannot be transferred to a DHCPvb 6 server by using a DHCPvb 6 process. In addition, by using the method in this embodiment, the AAA server and the DHCPvb 6 server may be two devices independent from each other, thereby solving a network restraint caused by combining the AAA server and the DHCPvb 6 server into one server and better facilitating development of an IPvb 6 service. Further, in this embodiment, the authorization information delivered by the AAA server is sent to the DHCPvb 6 server, so that the DHCPvb 6 server can dynamically allocate an IPv6 address or an IPvb 6 prefix in a designated address pool or prefix pool to a DHCPvb 6 client according to the authorization information, or designates a specific IPvb 6 address or IPv6 prefix for a DHCPvb 6 client according to the authorization information, thereby better fulfilling a flexibility requirement of an IPvb 6 service on configuration of a user address.

FIG. 5 is a schematic structural diagram of a server according to an embodiment of the present application. As shown in FIG. 5, the server in this embodiment includes a third receiving module 51 and an allocating module 52.

The third receiving module 51 is configured to receive authorization information which is encapsulated by using an option in a Relay-Forward message in a DHCPvb 6 process and sent by a relay device, where the authorization information is delivered by an AAA server to the relay device. The allocating module 52 is connected to the third receiving module 51 and is configured to allocate correct configuration information to a DHCPvb 6 client according to the authorization information.

The authorization information may be Framed-Pool, Delegated-IPv6-Prefix-Pool, Stateful-IPv6-Address-Pool, Delegated-IPv6-Prefix, or Framed-IPv6-Address delivered by the AAA server in a DHCPvb 6 allocation process, but is not limited thereto.

The server in this embodiment may be a DHCPvb 6 server in a DHCPvb 6 allocation process and the functional modules of the server may be configured to execute a corresponding process in the embodiment shown in FIG. 2B. For detailed operation principles, no further details are provided herein and reference may be made to the corresponding descriptions in the foregoing embodiments. The server provided in the embodiment of the present application cooperates with a relay device provided in the embodiment of the present application, and receives authorization information transferred by the relay device by using an option inserted into a Relay-Forward message; and the server can allocate correct configuration information to a client according to the authorization information, thereby solving the problem in the prior art that authorization information delivered by an AAA server cannot be transferred to a DHCPvb 6 server by using a DHCPv6 process.

It should be noted herein that, when the authorization information is not information related to address allocation, the server in this embodiment may not perform address information allocation based on the authorization information but may still receive the authorization information sent by the relay device.

Persons of ordinary skill in the art may understand that all or a part of the steps of the method embodiments may be implemented by a program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program runs, the steps of the method embodiments are performed. The storage medium includes: any medium that can store program code, such as a ROM, a RAM, a magnetic disk, an optical disc, and the like.

It should be finally noted that the foregoing embodiments are merely intended to describe the technical solutions of the present application rather than to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, as long as such modifications or replacements do not cause the nature of corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present application. 

What is claimed is:
 1. A method for transferring authorization information, comprising: receiving authorization information delivered by an Authentication-Authorization-Accounting (AAA) server; and inserting an option into a Dynamic Host Configuration Protocol for IPvb 6 (DHCPv6) Relay-Forward message, encapsulating the authorization information in the option, and sending the option to a DHCPvb 6 server.
 2. The method for transferring authorization information according to claim 1, wherein the inserting the option into the DHCPvb 6 Relay-Forward message, encapsulating the authorization information in the option, and sending the option to the DHCPvb 6 server comprises: inserting an option corresponding to each piece of the authorization information into the DHCPvb 6 Relay-Forward message; and encapsulating each piece of the authorization information in the corresponding option and sending the corresponding option to the DHCPvb 6 server.
 3. The method for transferring authorization information according to claim 1, wherein the inserting the option into the DHCPvb 6 Relay-Forward message, encapsulating the authorization information in the option, and sending the option to the DHCPvb 6 server comprises: inserting an option corresponding to all the authorization information into the DHCPvb 6 Relay-Forward message; and encapsulating all the authorization information in the option and sending the option to the DHCPvb 6 server.
 4. The method for transferring authorization information according to claim 3, wherein the encapsulating all the authorization information in the option and sending the option to the DHCPvb 6 server comprises: inserting a sub-option corresponding to each piece of the authorization information into the option; and encapsulating each piece of the authorization information in the corresponding sub-option and sending the corresponding sub-option to the DHCPvb 6 server.
 5. The method for transferring authorization information according to claim 1, wherein the authorization information comprises at least one of the following: a prefix pool name, an address pool name, a designated IPvb 6 prefix, and a designated IPvb 6 address.
 6. The method for transferring authorization information according to claim 5, further comprising: receiving corresponding configuration information which is provided by the DHCPv6 server for a DHCPvb 6 client according to the received authorization information.
 7. A relay device, comprising: a first receiving module, configured to receive authorization information delivered by an Authentication-Authorization-Accounting (AAA) server; and an encapsulating module, configured to insert an option into a Dynamic Host Configuration Protocol for IPvb 6 (DHCPv6) Relay-Forward message, encapsulate the authorization information in the option, and send the option to a DHCPvb 6 server.
 8. The relay device according to claim 7, wherein the encapsulating module comprises: a first inserting unit, configured to insert an option corresponding to each piece of the authorization information into the DHCPvb 6 Relay-Forward message; and a first transferring unit, configured to encapsulate each piece of the authorization information in the corresponding option and send the corresponding option to the DHCPv6 server.
 9. The relay device according to claim 7, wherein the encapsulating module comprises: a second inserting module, configured to insert an option corresponding to all the authorization information into the DHCPvb 6 Relay-Forward message; and a second transferring unit, configured to encapsulate all the authorization information in the option and send the option to the DHCPvb 6 server.
 10. The relay device according to claim 9, wherein the second transferring unit is configured to insert a sub-option corresponding to each piece of the authorization information into the option, encapsulate each piece of the authorization information in the corresponding sub-option, and send the corresponding sub-option to the DHCPvb 6 server.
 11. The relay device according to claim 7, wherein the authorization information comprises at least one of the following: a prefix pool name, an address pool name, a designated IPvb 6 prefix, and a designated IPvb 6 address.
 12. The relay device according to claim 11, further comprising: a second receiving module, configured to receive corresponding configuration information which is provided by the DHCPvb 6 server for a DHCPvb 6 client according to the received authorization information.
 13. A server, comprising: a receiving module, configured to receive authorization information which is encapsulated by using an option of a Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Relay-Forward message and sent by a relay device, wherein the authorization information is delivered by an Authentication-Authorization-Accounting (AAA) server to the relay device; and an allocating module, configured to allocate corresponding configuration information to a DHCPvb 6 client according to the authorization information.
 14. The server according to claim 13, wherein the authorization information comprises at least one of the following: Framed-Pool, Delegated-IPv6-Prefix-Pool, Stateful-IPv6-Address-Pool, Delegated-IPv6-Prefix and Framed-IPv6-Address. 